In the below example, I have 4 portlet controls on a page. If I move "Portlet 1" over to the right-hand portal column, the Toolbar in the BottomBar disappears (it looks like it hasn't taken the Toolbar height in to account after the Portlet has been moved):

<ext:ScriptManager runat="server" Theme="Slate"></ext:ScriptManager>

<ext:Store runat="server" ID="strData">
    <Reader>
    <ext:ArrayReader>
        <Fields>
        <ext:RecordField Name="UserName"></ext:RecordField>
        </Fields>
    </ext:ArrayReader>
    </Reader>
</ext:Store>

<ext:ViewPort ID="ViewPort1" runat="server">
    <Body>
    <ext:BorderLayout ID="BorderLayout1" runat="server">
        <North MaxHeight="100" MinHeight="100">
        <ext:Panel ID="Panel1" runat="server" Height="100" Width="650" BodyStyle="background-color: rgb(237, 240, 238);" Border="false" Frame="false">
            <Body>
            <p>Header goes here</p>
            </Body>
        </ext:Panel>
        </North>
        <West MaxWidth="400" MinWidth="180" Collapsible="true" Split="true">
        <ext:TreePanel ID="TreePanel1" runat="server" Title="Treepanel" Width="275" RootVisible="false">
            <Root>
            <ext:TreeNode Text="Dummy node" Icon="Book">
                <Nodes>
                <ext:TreeNode Text="Your Projects" Icon="Book">
                </ext:TreeNode>
                <ext:TreeNode Text="Timesheet" Icon="Clock">
                </ext:TreeNode>
                <ext:TreeNode Text="Reports" Icon="Report">
                </ext:TreeNode>
                <ext:TreeNode Text="Favourites" Icon="Star">
                </ext:TreeNode>
                </Nodes>
            </ext:TreeNode>
            </Root>
            <BottomBar>
            <ext:Toolbar runat="server">
                <Items>
                <ext:Button Icon="Anchor" Text="Test"></ext:Button>
                </Items>
            </ext:Toolbar>
            </BottomBar>
            <Tools>
            <ext:Tool Type="Help" Qtip="Help Guide" />
            </Tools>
        </ext:TreePanel>
        </West>
        <Center>
        <ext:TabPanel ID="tabPanel" runat="server" DeferredRender="true" TabWidth="180" MinTabWidth="160" ResizeTabs="true" EnableTabScroll="true">
            <Tabs>
            <ext:Tab runat="server" ID="tabDashboard" Title="Dashboard" Icon="Package" BodyStyle="background-color: rgb(237, 240, 238);">
                <Body>
                <ext:FitLayout runat="server">
                    <ext:Portal ID="Portal1" runat="server" Border="false" BodyStyle="background-color: rgb(237, 240, 238);">
                    <Body>
                        <ext:ColumnLayout ID="ColumnLayout2" runat="server">
                        <ext:LayoutColumn ColumnWidth=".5">
                            <ext:PortalColumn 
                            ID="PortalColumn1" 
                            runat="server" 
                            StyleSpec="padding:10px 0 10px 10px">
                            <Body>
                                <ext:AnchorLayout ID="AnchorLayout1" runat="server">
                                <ext:Anchor>
                                    <ext:Portlet Height="325" BodyStyle="background-color: rgb(237, 240, 238)" ID="ptlProjects" runat="server" Title="Portlet 1">
                                    <Body>
                                        <ext:FitLayout ID="FitLayout1" runat="server">
                                        <ext:GridPanel BodyStyle="padding: 0px;" ID="grdProjects" runat="server" StoreID="strData">
                                            <ColumnModel>
                                            <Columns>
                                                <ext:Column Header="UserName" DataIndex="UserName">
                                                </ext:Column>
                                            </Columns>
                                            </ColumnModel>
                                            <SelectionModel>
                                            <ext:RowSelectionModel></ext:RowSelectionModel>
                                            </SelectionModel>
                                            <BottomBar>
                                            <ext:Toolbar ID="Toolbar1111" runat="server">
                                                <Items>
                                                <ext:ToolbarFill ID="ToolbarFill1111" runat="server"></ext:ToolbarFill>

                                                <ext:Button ID="Button3" runat="server" Text="To Excel" Icon="PageExcel">
                                                    <Listeners>
                                                    <Click Handler="exportData(#{grdProjects}, #{hidFormatType}, 'xls');" />
                                                    </Listeners>
                                                </ext:Button>

                                                <ext:Button ID="Button4" runat="server" Text="To CSV" Icon="PageAttach">
                                                    <Listeners>
                                                    <Click Handler="exportData(#{grdProjects}, #{hidFormatType}, 'csv');" />
                                                    </Listeners>
                                                </ext:Button>
                                                </Items>
                                            </ext:Toolbar>
                                            </BottomBar>
                                        </ext:GridPanel>
                                        </ext:FitLayout>
                                    </Body>
                                    </ext:Portlet>
                                </ext:Anchor>
                                <ext:Anchor>
                                    <ext:Portlet Height="325" BodyStyle="background-color: rgb(237, 240, 238)" ID="Portlet1" runat="server" Title="Portlet 2">
                                    <Body>
                                        <ext:FitLayout ID="FitLayout5" runat="server">
                                        <ext:GridPanel BodyStyle="padding: 0px;" ID="GridPanel4" runat="server" StoreID="strData">
                                            <TopBar>
                                            <ext:Toolbar ID="Toolbar2" runat="server">
                                                <Items>
                                                <ext:Label ID="Label1" Html="&amp;nbsp;Criteria:&amp;nbsp;" StyleSpec="color: white;" runat="server"></ext:Label>
                                                <ext:TextField EnableKeyEvents="true" runat="server" ID="txtSearch" Width="320">
                                                </ext:TextField>
                                                </Items>
                                            </ext:Toolbar>
                                            </TopBar>
                                            <ColumnModel>
                                            <Columns>
                                                <ext:Column Header="UserName" ColumnID="colProjectTitle" DataIndex="UserName">
                                                </ext:Column>
                                            </Columns>
                                            </ColumnModel>
                                            <View>
                                            <ext:GroupingView ID="GroupingView12" runat="server" ForceFit="true" StartCollapsed="false" ShowGroupName="false" EnableNoGroups="true" HideGroupedColumn="true"></ext:GroupingView>
                                            </View>
                                            <Plugins>
                                                            <ext:GroupingSummary ID="GroupingSummary1" runat="server" />
                                                        </Plugins>
                                            <SelectionModel>
                                            <ext:RowSelectionModel></ext:RowSelectionModel>
                                            </SelectionModel>
                                        </ext:GridPanel>
                                        </ext:FitLayout>
                                    </Body>
                                    </ext:Portlet>
                                </ext:Anchor>
                                </ext:AnchorLayout>
                            </Body>
                            </ext:PortalColumn>
                        </ext:LayoutColumn>
                        <ext:LayoutColumn ColumnWidth=".5">
                            <ext:PortalColumn 
                            ID="PortalColumn3" 
                            runat="server" 
                            StyleSpec="padding:10px">
                            <Body>
                                <ext:AnchorLayout ID="AnchorLayout3" runat="server">
                                <ext:Anchor>
                                     <ext:Portlet Height="325" BodyStyle="background-color: rgb(237, 240, 238)" ID="ptlMessages" runat="server" Title="Portlet 3">
                                    <Body>
                                        <ext:FitLayout ID="FitLayout2" runat="server">
                                        <ext:GridPanel BodyStyle="padding: 0px;" ID="GridPanel2" runat="server" StoreID="strData">
                                            <ColumnModel>
                                            <Columns>
                                                <ext:Column Header="UserName" DataIndex="UserName">
                                                </ext:Column>
                                            </Columns>
                                            </ColumnModel>
                                            <SelectionModel>
                                            <ext:RowSelectionModel></ext:RowSelectionModel>
                                            </SelectionModel>
                                        </ext:GridPanel>
                                        </ext:FitLayout>
                                    </Body>
                                    </ext:Portlet>
                                </ext:Anchor>
                                <ext:Anchor>
                                    <ext:Portlet Height="325" BodyStyle="background-color: rgb(237, 240, 238)" ID="ptlApprovals" runat="server" Title="Portlet 4">
                                    <Body>
                                        <ext:FitLayout ID="FitLayout3" runat="server">
                                        <ext:GridPanel Stateful="false" BodyStyle="padding: 0px;" ID="grdApprovals" runat="server" StoreID="strData">
                                            <ColumnModel>
                                            <Columns>
                                                <ext:Column Header="UserName" DataIndex="UserName" />
                                            </Columns>
                                            </ColumnModel>
                                            <View>
                                            <ext:GroupingView ID="GroupingView13" runat="server" ForceFit="true" StartCollapsed="true" ShowGroupName="false" EnableNoGroups="true" HideGroupedColumn="true"></ext:GroupingView>
                                            </View>
                                            <SelectionModel>
                                            <ext:CheckboxSelectionModel SingleSelect="false"></ext:CheckboxSelectionModel>
                                            </SelectionModel>
                                            <Plugins>
                                                            <ext:GroupingSummary ID="GroupingSummary2" runat="server" />
                                                        </Plugins>
                                            <BottomBar>
                                            <ext:Toolbar ID="Toolbar3" runat="server">
                                                <Items>
                                                <ext:ToolbarButton Text="Approve" Icon="Tick"></ext:ToolbarButton>
                                                <ext:ToolbarButton Text="Reject" Icon="Cross"></ext:ToolbarButton>
                                                <ext:ToolbarFill ID="ToolbarFill2" runat="server"></ext:ToolbarFill>

                                                <ext:Button ID="Button1" runat="server" Text="To Excel" Icon="PageExcel">
                                                    <Listeners>
                                                    <Click Handler="exportData(#{grdApprovals}, #{hidFormatType}, 'xls');" />
                                                    </Listeners>
                                                </ext:Button>

                                                <ext:Button ID="Button2" runat="server" Text="To CSV" Icon="PageAttach">
                                                    <Listeners>
                                                    <Click Handler="exportData(#{grdApprovals}, #{hidFormatType}, 'csv');" />
                                                    </Listeners>
                                                </ext:Button>
                                                </Items>
                                            </ext:Toolbar>
                                            </BottomBar>
                                        </ext:GridPanel>
                                        </ext:FitLayout>
                                    </Body>
                                    </ext:Portlet>
                                </ext:Anchor>
                                </ext:AnchorLayout>
                            </Body>
                            </ext:PortalColumn>
                        </ext:LayoutColumn>
                        </ext:ColumnLayout>    
                    </Body>
                    </ext:Portal>
                </ext:FitLayout>
                </Body>
            </ext:Tab>
            </Tabs>
        </ext:TabPanel>
        </Center>
    </ext:BorderLayout>
    </body>
</ext:ViewPort>